"The excellence of this practice and its fruitfulness for christian virtue," preached Pope St. Pius X, "are clearly established by the teaching of the great masters of the spiritual life." St. Ignatius of Loyola considered the examination of conscience as the single most important spiritual exercise.
St. Ignatius included the Examination in the Spiritual Exercises and already there he presents different forms of it (particular and general examination, see in [24-43] in the book of the Spiritual Exercises, with the customary marginal numbers ). Since then the method became known under various names in the spiritual literature and practice, it is called sometimes “Awareness Examen”, sometimes “Daily Examination of Consciousness” in  for example.
In general, there is a distinction between the “Particular Examen”, which aims to change one particular feature or defect in ones behavior and the “Daily Examination of Consciousness”, which is a prayerful review of one day and finally the “General Examination of Conscience”. This last method is called examination of “conscience” because it is a review of one’s actions from a moral point of view, reflecting upon one’s responsibility and looking at one’s sins and weaknesses in preparation for repentance in contrast with the examination of “consciousness” which does not focus on morality even if sins will emerge during the review of the day. See , 
Some of the ancient philosophers -- the Stoics in particular -- studied to be blameless in their own sight, and for this they made frequent use of self-inspection. They professed the doctrine that the happiness and dignity of man consist in virtue, or compliance with the law of reason, or with conscience; and thus examinations of conscience were a regular practice in the schools of the Stoics and of their later followers, such Eclectics as Quintus Sextius and Seneca.
Examination of conscience was commanded by the Apostle St. Paul to be performed by the faithful each time they received Holy Communion: "But let a man examine himself, and so let him eat of the bread, and drink of the cup. For he who eats and drinks in an unworthy way eats and drinks judgment to himself.... For if we discerned ourselves, we wouldn't be judged" ( , WEB). And, as the early Christians received Holy communion very frequently, examination of conscience became a familiar exercise of their spiritual life. Thus we read of the great hermit St. Anthony, that he examined his conscience every night, while St. Basil of Caesarea, St. Augustine of Hippo and St. Bernard of Clairvaux, and founders of religious orders generally made the examination of conscience a regular daily exercise of their followers. What was thus enjoined on religious by rule was inculcated upon the faithful at large by the masters of the spiritual life as a most effectual means to advance in virtue.
St. Bernard taught: "As a searching investigator of the integrity of your own conduct, submit your life to a daily examination. Consider carefully what progress you have made or what ground you have lost. Strive to know yourself. Place all your faults before your eyes. Come face to face with yourself, as though you were another person, and then weep for your faults."
Distinct from this is the examination required as a proximate preparation for sacramental confession. As discretion is to be used in remitting or retaining sins, the confession of the sinner is necessary and to confess his faults he must examine his conscience with proper diligence.
As to the daily examination of conscience, two species must be distinguished, the general and the particular. The former aims at the correction of all kinds of faults, the latter at the avoidance of some particular fault or the acquisition of some particular virtue.
As to the importance of this practice, St. Pius X taught in Haerent Animo:
- The excellence of this practice and its fruitfulness for christian virtue are clearly established by the teaching of the great masters of the spiritual life.
- Experience shows that the man who frequently subjects his thoughts, words and actions to a strict examination, gains new strength of soul both to detest and fly from evil and to desire and strive for the good.
Among secular intellectuals, particularly Marxists, the term autocritique, borrowed from the French, is used. This is particularly applied to a public, "methodological attempt to step away from themselves through a process of self-objectification", and was popular in France following the Algerian War. Edgar Morin's questioning of his own motives as a defender of Algeria popularised the term; other well-known examples include Jawaharlal Nehru's anonymous dissection of his own personality and drive in the Modern Review.
- ↑ Daily Examination of Consciousness: A simple way to better your life in 
- ↑ These forms of the Examination are presented in the chapter "The method and the First Exercise: existential experience of the history of salvation" of the Spiritual Exercises for Married Couples: Finding Our Way Together with St. Ignatius - Manual for the Retreat
- ↑ Cf. in the online text of The Spiritual Exercises of St. Ignatius
- ↑ Le Sueur, James D.; Uncivil War: Intellectuals and Identity Politics During the Decolonization, University of Pennsylvania press, 2001